The Purifiers, also known as the Stryker Crusade, are a fictional paramilitary/terrorist organization in the Marvel Comics universe and enemies of the X-Men. Created by writer Chris Claremont and artist Brent Anderson, they first appeared in the 1982 graphic novel X-Men: God Loves, Man Kills.
A force of Christian fundamentalists led by the ruthless Reverend William Stryker, the Purifiers see themselves in a holy war against mutants, believing them to be the children of the Devil and thus worthy of extermination. The Purifiers made only sporadic appearances since their first appearance, but returned to prominence in the 2000s, when they became prominent antagonists in the series New X-Men and X-Force, and played a major role in the 2007 - 2008 crossover storyline X-Men: Messiah Complex.
Read more about Purifiers: Fictional Organization Biography, Powers and Abilities